// 行高
// 用于控制元素的前行距（行高）的功能类。
.leading-3
  line-height .75rem

.leading-4
  line-height 1rem

.leading-5
  line-height 1.25rem

.leading-6
  line-height 1.5rem

.leading-7
  line-height 1.75rem

.leading-8
  line-height 2rem

.leading-9
  line-height 2.25rem

.leading-10
  line-height 2.5rem

.leading-none
  line-height 1

.leading-tight
  line-height 1.25

.leading-snug
  line-height 1.375

.leading-normal
  line-height 1.5

.leading-relaxed
  line-height 1.625

.leading-loose
  line-height 2
